jargons

• compounded = product

• sub-duplicate = squareroot

• duplicate = squared

• triplicate = cube

simple trick you missed

you must have a common denotion

• here ratio is for the number of coins and not values

RATIO TRICKS

type1

• things to look for

  • difference in the income and expense ratio is same

  • their savings must be same as well

• only then you can use the trick below

• 

  • here they asking A's salary

• here difference is one so

$$1u = 500$$

• using this we can get anything

type2

• things to look for

  • difference in the income and expense ratio is same

  • their savings aint gonna be same

• 

  • here they asking B's salary

• here we do $5*4-6*3 = 2u$ for lhs

• here for we do $4*1800-3*1600$ for rhs

• finally you have

$$2u=2400$$

• hence you have 1 unit as 1200

type3

• things to look for

  • difference in the income and expense ration is different

  • their savings is same

• 

  • here they asking B's salary

• make the difference the ratio's numerator and denominator as same

• here 2 is multiplied for income ratio cuz it is the lcm of $3-2$ and $5-3$m and TOTALLY discard the previous ratio

• yo answer is $1500*4 = 6000$

!! attention!!

• see here the difference between new ratio and the age differnce is same so just add the 12 to initial ratio.

leaving and joining

• try out the options

tricky

• here ratio is for previous and new.

• try to go according to the root formula of things.

• like here total labpor income is your formula